3-(aminoalkoxy)-estra-1, 3, 5(10)-trien-17beta-ol compounds



United States Patent 3,214,446 3-(AMINOALKOXY)-ESTRA-1,3,5(10)-TRIEN-17p-0L COMPOUNDS David Darwin Evans, Staines, Middlesex, David Eurof Evans, Surrey, and Peter John Palmer, Twickenham, Mlddlesex, England, assignors to Parke, Davis & Company, Detroit, Mich., a corporation of Michigan No Drawing. Filed Jan. 15, 1964, Ser. No. 337,755 Claims priority, application Great Britain, Jan. 17, 1963, 2,197/ 63 4 Claims. (Cl. 260-3975) The present invention relates to novel aminoalkoxysteroid compounds and to methods for their production. More particularly, the invention relates to 3-(aminoalkoxy)-estra-1,3,5(10)-trien-17,B-ol compounds having the formula $5 n no with an aminoalkyl halide of the formula 1\ (CH) X 2 u 2 (III) in the presence of a base. In the above formulas X represents a halogen atom, preferably bromine or chlorine, and n, R, R and R have the same significance as in Formula I. The reaction is suitably carried out in an alcoholic solvent such as ethanol, n-propanol, isopropanol, and the like; other solvents, such as water and N,N-dimethylformamide, and mixtures of these with alcohols, may also be used. The temperature and duration of the reaction may be varied over a wide range from 25 C. for 1624 hours to the reflux temperature of the solvent for 30-60 minutes. A preferred method is to reflux an ethanolic solution of the reactants for 30-60 minutes. Equimolar amounts of the reactants may be used; it is preferable, however, to employ the aminoalkyl halide and the base in slight excess. When the aminoalkyl halide is introduced into the reaction as an acid-addition salt, additional base is required. Preferred bases for the reaction are the alkali metal hydroxides, sodium hydroxide and potassium hydroxide.

3,244,444 Patented Get. 26, 1965 The compounds of the invention can exist in the free base form having Formula I or in the form of one of their acid-addition salts with a variety of inorganic or organic acids. Some representative nontoxic, pharmaceuticallyacceptable acid-addition salts are the hydrochloride, hydrobromide, hydriodide, sulfate, phosphate, citrate, acetate, tartrate, benzoate, benzene-sulfonate, and the like. When it is desired to employ the compounds of the invention in the form of one of their acid-addition salts, the salt formation is suitably carried out by reacting the selected base with the selected acid in an unreactive solvent. The acid-addition salts can be converted to the free bases by reaction with a base such as sodium hydroxide or potassium hydroxide.

The compounds of the invention are useful pharmacological agents, exhibiting hormonal activity. They are anti-fertility agents and hypocholesteremic agents that exhibit a low degree of estrogenieity. They are, in addition, pituitary inhibitors. They are active upon oral administration.

The invention is illustrated 'by the following examples.

Example 1 A mixture of 2.9 g. of 17a-ethinylestradiol, 1.6 g. of N,N-dimethyl-O-chloroethylamine hydrochloride, and 4.1 ml. of 5 N aqueous potassium hydroxide in 50 ml. of ethanol is heated under reflux for minutes. After cooling, the mixture is diluted with water and extracted with ether. The ether solution is washed first with Claisens alkali (prepared by dissolving 35 g. of potassium hydroxide in 25 ml. of water, cooling, and diluting the solution with 100 ml. of methanol), then several times with water, and is dried over anhydrous magnesium sulfate. The dried solution is evaporated to dryness, and the 3-(B-dimethylaminoethoxy)-estra-1,3,5 10) -trien-17a-ethinyl-17,8-ol obtained is recrystallized from methanol; M.P. 162-1645 C.

An ethereal solution of 6 (fi-dimethylaminoethoxy)- estra-1,3,5(10)-trien 17a-ethinyl 17fl-o1 is treated with a slight excess of hydrogen chloride, the resulting mixture is concentrated, and the precipitated hydrochloride salt of 3 (B-dimethylaminoethoxy)-estra-1,3,5 10)-trien17aethinyl-17fi-ol is isolated by filtration, washed with ether, and dried.

Example 2 A mixture of 2.9 g. of 17u-ethinylestradio1, 2.1 g. of N,N-diethyl-' -chloropropylamine hydrochloride, and 4.1 ml. of 5 N aqueous potassium hydroxide in ml. of ethanol is heated under reflux for 45 minutes. After cooling, the mixture is diluted with water, and extracted with ether. The ethereal extract is diluted with an equal volume of benzene, and the solution is washed first with Claisens alkali, then with water, and is extracted with an aqueous solution of citric acid. The aqueous solution, containing the citrate salt of 3-(y-diethylaminopropoxy)-estra-1,3,5(10)-trien-17a-ethinyl-17fl-ol, is washed with ether and made alkaline with 2 N aqueous sodium hydroxide. The alkaline mixture is extracted with ether, and the ether solution is Washed with water, dried over anhydrous magnesium sulfate, and evaporated to dryness to give the desired 3-('y-diethylaminopropoxy)-estra- 1,3,5(l0)-trien-17a-ethinyl-17fi-ol, M.P. 86.5-88.5 C., after recrystallization from n-hexane.

In the above procedure, equivalent amounts of N,N-diethyl-'y-bromopropylamine hydrochloride and sodium hydroxide may be substituted for N,N-diethyl-' -chloropropylamine hydrochloride and potassium hydroxide, respectively, to prepare the same product.

Example 3 A mixture of 2.9 g. of 17a-ethinylestradio1, 2.4 g. of N benzyl N methyl-B-chloroethylamine hydrochloride, and 4.1 ml. of 5 N aqueous potassium hydroxide in ml. of ethanol is heated under reflux for 45 minutes. After cooling, the mixture is diluted with water, and extracted with ether. The ethereal extract is diluted with an equal volume of benzene, and the solution is washed first with Claisens alkali, then with water, and is extracted with an aqueous solution of citric acid. The aqueous solution, containing the citrate salt of 3-[fi-(N-benzyl-N- methylamino)-ethoxy] -estra- 1,3,5 10)-trien-l7a-ethinyl- 17,8-01, is washed with ether and made alkaline with 2 N aqueous sodium hydroxide. The alkaline mixture is extracted with ether and the ether solution is washed with water, dried over anhydrous magnesium sulfate, and evaporated to dryness to give the desired 3-[B-(N-benzyl-N- methylamino) ethoxy] estra-1,3,5 l) -trlI1-170t-th'lI1y1- 175-01.

The free base is dissolved in ether, the ether solution is treated with a slight excess of hydrogen chloride, the resulting mixture is concentrated, and the precipitated 3-[[3-(N-benzyl-N-methylamino) -ethoxy] -estra-1,3 ,5 10)- trien-l7a-ethinyl-l7fi-ol hydrochloride hemi-hydrate is isolated by filtration, washed with ether, and dried; M.P. 117-119" C.

By employing the procedure described above, from 2.9 g. of l7a-ethinylestradiol and 3.0 g. of N-benzyl-N-methyl-v-bromopropylamine hydrochloride, there is obtained 3-[ -(N-benzyl N methylamino)-propoxy]estra-1,3,5- (l0)-trien-l7a-ethinyl-175-01, M.P. 8991 C., after recrystallization from a mixture of acetone and n-hexane.

Example 4 A mixture of 2.8 g. of 17a-methylestradiol, 1.7 g. of N,N-dimethyl-y-chloropropylamine hydrochloride, and 4.1 ml. of 5 N aqueous potassium hydroxide in 50 ml. of ethanol is heated under reflux for 45 minutes. After cooling, the mixture is diluted with water and extracted with ether. The ether solution is washed first with Claisens alkali, then several times with water and is dried over anhydrous magnesium sulfate. The dried solution is evaporated to dryness, and the 3-( -dimethy1- aminopropoxy)-estra 1,3,5 trien-17a-methyl-l7fl- 01 obtained is recrystallized from n-hexane; M.P. 85-86 C.

In the foregoing procedure, 3.0 g. of l7a-ethylestradiol and 1.6 g. of N,N-dimethyl-;8-chloroethylamine hydrochloride may be substituted for the 17a-methylestradiol and the N,N-dimethyl-'y-chloropropylamine hydrochloride, respectively, to prepare 3-(fi-dimethylaminoethoxy)- estra-1,3,5(10)-trien-l7a-ethyl-17B-ol, M.P. 6668 C., after recrystallization from n-hexane.

Example 5 A mixture of 3.1 g. of 17a-n-pr0pylestradiol, 1.7 g. of N,N-dimethyl-'y-chloropropylamine hydrochloride and 4.1 ml. of 5 N aqueous potassium hydroxide in 75 ml. of ethanol is heated under reflux for 45 minutes. After cooling, the mixture is diluted with water and extracted with ether. The ethereal extract is diluted with an equal volume of benzene and the solution is washed first with Claisens alkali, then with water and is extracted with an aqueous solution of citric acid. The aqueous solution, containing the citrate salt of 3-(y-dimethylaminopropoxy) estra 1,3,5(10) trien-17a-n-pr0py1- 17p 01, is washed with ether and made alkaline with 2 N sodium hydroxide. The alkaline mixture is extracted with ether and the ether solution is washed with water, dried over anhydrous magnesium sulfate and evaporated to dryness to give the desired 3-('y-dimethylaminopropoxy)-estra- 1,3,5(l0)-trien-17a-n-propyl-l7fl-ol. The free base is dissolved in ether, the solution is treated with an excess of dry hydrogen chloride and the hydrochloride salt obtained is purified by sublimation; M.P. 208210 C.

Example 6 A mixture of 3.0 g. of 17a-vinylestradi ol, 1.7 g. of N,N-dimethyl-'y-chloropropylamine hydrochloride and 4.1

ml. of S N aqueous potassium hydroxide in 75 ml. of ethanol is heated under reflux for minutes. After cooling, the mixture is diluted with water and extracted with ether. The ethereal extract is diluted with an equal volume of benzene and the solution is washed first with Claisens alkali, then with water and is extracted with an aqueous solution of citric acid. The aqueous solution, containing the citrate salt of 3-(y-dimethylaminopropoxy)-estra-l,3,5(10)-trien-17a-vinyl-17p3-ol, is washed with ether and made alkaline with 2 N sodium hydroxide. The alkaline mixture is extracted with ether and the ether solution is washed with water, dried over anhydrous magnesium sulfate and evaporated to dryness to give the desired 3-(' -dimethylaminopropoxy)-estral,3,5(10)-trien-l7ot-vinyl-17B-ol, M.P. 83.5-85.5 C., after recrystallization from n-hexane.

Example 7 A mixture of 3.1 g. of 17oc-allylestradiol, 1.7 g. of N,N-dimethyl-' -chloropropylamine hydrochloride and 4.1 ml. of 5 N aqueous potassium hydroxide in ml. of methanol is heated under reflux for 45 minutes. After cooling, the mixture is diluted with water and extracted with ether. The ethereal extract is diluted with an equal volume of benzene and the solution is washed first with Claisens alkali, then with water and is extracted with an aqueous solution of citric acid. The aqueous solution, containing the citrate salt of 3-('y-dimethylaminopropoxy)-estra-l,3,5(10)-trien-17a-allyl-l7fi-ol, is washed with ether and made alkaline with 2 N sodium hydroxide.

The alkaline mixture is extracted with ether and the ether solution is washed with water, dried over anhydrous magnesium sulfate and evaporated to dryness to give the desired 3-('y-dimethylaminopropoxy)-estra 1,3,5(10)- trien-17a-allyl-l7fi-ol, M.P. 7274 C., after recrystallization from n-hexane.

We claim:

1. A member of the class consisting of 3-(aminoalkoxy) estra-1,3,5(10)-trien-l7B-ol compounds of the formula and pharmaceutically acceptable acid-addition salts thereof; where n is a positive integer greater than 1 and less than 6; R is chosen from the class consisting of lower alkyl and benzyl; R represents lower alkyl; and R is chosen from the class consisting of lower alkyl, vinyl, allyl, and ethinyl.

2. 3-(fi-dimethylaminoethoxy)-estra-1,3,5(l0) trienl7aethinyl-l7fl-ol.

3. 3-['y-(N-benzyl-N-methylamino)-propoxy] estra- 1,3,5( 10) -trien-17a-ethinyl-17fl-ol.

4. 3 -dimethylaminopropoxy) estra 1,3,5(10)- trien-17a-methyl-17B-ol.

References Cited by the Examiner UNITED STATES PATENTS 3,060,204 10/62 Cantrell et a1 260397.5 3,076,826 2/ 63 Clinton et a1. 260397.5 3,076,829 2/ 63 Reimann et al 260397.45 3,094,541 6/63 Cantrall et al 2603975 3,107,257 10/63 Counsell 260297.5

LEWIS GOTTS, Primary Examiner. 

1. A MEMBER OF THE CLASS CONSISTING OF 3-(AMINOALKOXY) ESTRA-1,3,5(10)-TRIEN-17B-OL COMPOUNDS OF THE FORMULA 